SATA hard disk drive connector

1. A SATA hard disk drive connector, comprising: a body connected to a SATA hard disk drive; a signal pin unit disposed at the body and having a first signal transmitting pin, a second signal transmitting pin, a first signal receiving pin, a second signal receiving pin and a plurality of first grounding pins; a power pin unit disposed at the body and having a plurality of power pins and a plurality of second grounding pins; four micro coaxial cables each having a conducting wire, a tubelike insulating inner layer, a tubelike shielding woven layer and a tubelike insulating coating arranged from inside to outside, wherein the conducting wires are electrically connected to the first signal transmitting pin, the second signal transmitting pin, the first signal receiving pin and the second signal receiving pin, respectively, at one end and electrically connected to an external cable at another end; a first grounding unit disposed at the body and electrically connected to an end of each of the tubelike shielding woven layers and the first grounding pins; a second grounding unit disposed at the body and electrically connected to the second grounding pins, another end of each of the tubelike shielding woven layers, and the external cable; and an electrical connection unit disposed at the body and electrically connected to the power pins and the external cable.

2. The SATA hard disk drive connector of claim 1 , wherein the body is provided with a first slot, the signal pin unit with three first grounding pins, and the first grounding unit with a first board, wherein an edge of the first board has a first engagement plate extending outward and bending, four first clamp slots extending outward and bending, and three first grounding plates extending outward and spaced apart from each other, wherein every two first clamp slots are disposed between every two first grounding plates, with the first engagement plate inserted into the first slot, wherein the first clamp slots each clamp an end of a corresponding one of the tubelike shielding woven layers, wherein the first grounding plates are electrically connected to the first grounding pins, respectively.

3. The SATA hard disk drive connector of claim 1 , wherein the body is provided with a third slot, the power pin unit with three power pins, and the electrical connection unit with a third board, wherein an edge of the third board has a third engagement plate extending outward and bending and three third outward electrical connection pins extending outward and spaced apart from each other, with the third engagement plate inserted into the third slot, wherein the third board is electrically connected to the power pins, wherein the third outward electrical connection pins are electrically connected to the external cable.

4. The SATA hard disk drive connector of claim 1 , wherein the body has a receiving chamber, wherein a limiting opening is disposed at an edge of the receiving chamber, wherein the receiving chamber receives a plug of the external cable, wherein the limiting opening is smaller than the plug of the external cable to thereby confine the plug of the external cable to the receiving chamber.

5. The SATA hard disk drive connector of claim 4 , wherein a stop bump is disposed on each of two sides on top of the receiving chamber and protrudes into the receiving chamber such that the stop bumps abut against the plug of the external cable.

6. The SATA hard disk drive connector of claim 1 , wherein the body is provided with a second slot, the power pin unit with five second grounding pins, and the second grounding unit with a second board, wherein an edge of the second board has a second engagement plate extending outward and bending, four second clamp slots extending outward and bending, and three second outward grounding pins extending outward and spaced apart from each other, wherein every two second clamp slots are disposed between every two second outward grounding pins, with the second engagement plate inserted into the second slot, wherein the second clamp slots each clamp another end of a corresponding one of the tubelike shielding woven layers, wherein the second board is electrically connected to the second grounding pins, wherein the second outward grounding pins are electrically connected to the external cable.

7. The SATA hard disk drive connector of claim 6 , wherein the edge of the second board has five second grounding plates extending outward and spaced apart from each other, wherein the body is provided with a third slot, the power pin unit with three power pins, and the electrical connection unit with a third board, wherein the edge of the third board has a third engagement plate extending outward and bending, three third electrical connection plates extending outward and spaced apart from each other, and three third outward electrical connection pins extending outward and spaced apart from each other, with the third engagement plate inserted into the third slot, with the third electrical connection plates electrically connected to the power pins, respectively, with the second grounding plates electrically connected to the second grounding pins, respectively, wherein the third electrical connection plates are disposed between two second grounding plates and three second grounding plates, with the third outward electrical connection pins electrically connected to the external cable.

8. The SATA hard disk drive connector of claim 1 , further comprising a protective lid, wherein two abutting blocks are disposed on an inner side of the protective lid and spaced apart from each other, wherein the protective lid is disposed at the body to hide the signal pin unit, the power pin unit, the micro coaxial cables, the first grounding unit, the second grounding unit and the electrical connection unit, wherein the protective lid hides a plug of the external cable, wherein the abutting blocks abut against two sides of the plug of the external cable, respectively.

9. The SATA hard disk drive connector of claim 8 , wherein a plurality of snap-engagement tenons is disposed at an edge of the body, and a plurality of snap-engagement arms is disposed at an edge of the protective lid, with the snap-engagement arms each having a snap-engagement mortise, wherein the snap-engagement mortises are snap-engaged with the snap-engagement tenons, respectively.